Re: Q: is RFC3531 still applicable?

[William Herrin <bill () herrin us>]

On Wed, May 15, 2024 at 10:09 PM Mel Beckman <mel () beckman org> wrote:
> The RFC seems to be concerned with aggregation efficiency, and while that may be a concern someday, so far computer 
> and memory capacity has far outstripped prefix growth in the default-free zone.
>
> If you can explain why a /64 would ever not be enough for a single subnet, I’m willing to listen.

The subnet contains a router that gateways to another /64. For
example, there's a home automation controller and the controller
implements its own lan of components on a different media type.

Instead of assigning a pair of /64's, you assign a /63 and then route
a /64 from the /63 to the home automation controller.

Except you don't do that either. IPv6 is plentiful and reverse-DNS
delegates cleanly on 4-bit boundaries so you think in terms of 4-bit
boundaries instead: assign a /60, use a /64 on the immediate LAN and
route a /64 to the home automation controller and retain the balance
for the next device that wants to implement an internal subnet.

Regards,
Bill Herrin



-- 
William Herrin
bill () herrin us
https://bill.herrin.us/